METHOD FOR DETERMINING A COEFFICIENT OF RESIDUAL WATER SATURATION OF ROCKS Russian patent published in 2018 - IPC G01N23/83 

FIELD: measurement technology.

SUBSTANCE: usage to determine the coefficient of residual water saturation of rocks. Invention consists in that samples of cores of a given lithological type in a wide range of filtration-capacitive properties are taken, after which the taken samples are scanned with an X-ray tomographic scanner to obtain three-dimensional images of the samples that segment them into pore space and the rock skeleton, several fragments from each segmented three-dimensional image are separated, porosity value for each fragment is determined, then fluid velocity values at discrete points of the pore space using a hydrodynamic simulator are determined, histogram of the fluid velocity is constructed, fragment with a porosity as close as possible to the porosity of the actual core sample from the lithotype under study is selected, threshold value of the fluid velocity is determined proceeding from the observation of the following condition: fraction of velocities from the total area of the histogram below the threshold value of the fluid velocity is numerically equal to the residual water saturation coefficient of the real sample previously determined experimentally, then the selected threshold value of the fluid velocity is assigned to all selected fragments and, based on the division into categories of mobility of fluid fluids, the whole pore space in which the fluid velocity is below the threshold value is compared to the space filled with residual water, for each selected fragment the residual water saturation coefficient is calculated as the ratio of the volume of pores filled with residual water to the total pore volume.

EFFECT: providing information on the coefficient of residual water saturation of a weakly consolidated core and small collections of core material.

1 cl, 4 dwg